Compilare: user.cpp: In function ‘int main()’: user.cpp:24:17: warning: unused variable ‘nr’ [-Wunused-variable] int n,l,k,i,nr,j,p; ^ user.cpp:24:20: warning: unused variable ‘j’ [-Wunused-variable] int n,l,k,i,nr,j,p; ^ user.cpp:25:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&l,&k); ^